Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c2918abc13b0c1…

MALICIOUS

PDF

82.3 KB Created: 2021-07-06 06:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe424b8e12abad22808aea2db7ffd7bb SHA-1: 9e874260faeecc482a071a45b8fbf53f3977e128 SHA-256: 70c2918abc13b0c1d1dd063e42055c4879f495cf9daf61e501e28deb99face27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely leveraging techniques associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kimdaiphatsteel.com/Images_upload/files/4735305782.pdf In PDF document text
    • http://skyline1968.com/clients/74864/File/goruz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gu37isfh8gsgd4hj0vveh8034o/zinijek.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/19260502228.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608304b643e79---gekexu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9ba13dad---66233032554.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9ae1d189b93c1e97f457f9c10c14ff12/89318012281.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/jonuded.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/s5iq1oek2n5l1bf950snl4lecp/jabonudaba.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/63223675919.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/26008092940.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c626232bb00---tenipafatapifinivowuw.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be1b62b59---towarexixufeninutusa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3f59cd5aae9cf032c02ac8fd1f8087c9/fibojujunarixovevul.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/33474134905.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756908c6da2---97546493353.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kizadakukowesifiluxoten.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7624ab35---32877251323.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/28078495303.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160744842cf5c8---80908516041.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d000562e0812af5fe0772f23a70ce14f/42996085814.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/mejemigalezidojofufag.pdfIn PDF document text
    • http://ezibra.pl/upload//file/bexozipapofebokipokose.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/1624215732.pdfIn PDF document text
    • https://angkagenap.com/contents//files/12776186957.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609122ac36680---28859542779.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf1ee5843---pobebun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gilbert+strang+linear+algebra+and+learning+from+data+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 11020 bytes
SHA-256: d44d92e72728f33ae30ef8f3b9576a165c6a9c12c8b86217455f6d7a51620386
font_01_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 18116 bytes
SHA-256: 19fae538f510fda8fd8a3c126774e49e9f493c6cda5cfe4e12049dc9bbd14cdd
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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